Define the entire metropolitan area network as an SR domain to ensure that the node labels of all nodes in the SR domain are not repeated. The node label can only be allocated in the SRGB space, so it is necessary to ensure that the size of the SRGB space can support the number of all nodes in the metropolitan area network, and it is recommended that it be no less than 64K. Each node in the domain allocates a different node label from this space.
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